I would suggest looking through the first page a bit before u make a thread like this again because there are almost always at least 2 threads like this up. To make life easier for ya check out my thread: New Build w/ Low Budget *Need Help*
because I am in the exact same position as you, trying to build a comp for AoC and some other games. I you need an OS it comes to about $720 after mail-in rebates and about $625 if you dont need one. The best thing about it is that this comp will be able to run AoC on maxed setting while still getting great fps.
See u in game if u happen to roll Cimmeria server (RP-PVP, friends picked it...dont ask). At least I'll get to make fun of an RPer here and there when I'm bored.
And to be honest I wouldnt bother with a quad core, its gonna add quite a bit to your cost and from what I've heard and read it wont make that big of a difference when it comes to your gaming performance. You also said you wanted the most ram possible which might not be the best route, 2GB will be fine, especially if you have AoC in mind. Just be sure to get good ram and you will be more than set.